While there is a whole lineup of things you could try to keep your avocados from browning, the answer to your avocado-preserving woes lies in your cooking spray.

The fragile compounds in the avocado react with air, browning quickly. Cooking spray prevents oxidation by creating a much tighter barrier against oxygen than other methods.

Cooking spray is a great preserver, so spray a little bit on one half of your avocado and keep it in your fridge. When ready to eat, just wipe the oil off your fruit, and voila.